Mesa (master): mesa: check for null ptr in _mesa_is_bufferobj()

[Brian Paul]

Module: Mesa
Branch: master
Commit: 56b870e44106188f425df6eb45b7a394f0420e5e
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=56b870e44106188f425df6eb45b7a394f0420e5e

Author: Brian Paul <brianp at vmware.com>
Date:   Wed Nov 23 15:33:46 2011 -0700

mesa: check for null ptr in _mesa_is_bufferobj()

This simplifies a few callers.  And it adds a bit of robustness.

Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Yuanhan Liu <yuanhan.liu at linux.intel.com>

---

 src/mesa/main/bufferobj.c        |    6 +++---
 src/mesa/main/bufferobj.h        |    2 +-
 src/mesa/state_tracker/st_draw.c |   10 +++++-----
 3 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/src/mesa/main/bufferobj.c b/src/mesa/main/bufferobj.c
index 4c77397..8e8fcd5 100644
--- a/src/mesa/main/bufferobj.c
+++ b/src/mesa/main/bufferobj.c
@@ -1286,14 +1286,14 @@ _mesa_CopyBufferSubData(GLenum readTarget, GLenum writeTarget,
    ASSERT_OUTSIDE_BEGIN_END(ctx);
 
    src = get_buffer(ctx, readTarget);
-   if (!src || !_mesa_is_bufferobj(src)) {
+   if (!_mesa_is_bufferobj(src)) {
       _mesa_error(ctx, GL_INVALID_ENUM,
                   "glCopyBuffserSubData(readTarget = 0x%x)", readTarget);
       return;
    }
 
    dst = get_buffer(ctx, writeTarget);
-   if (!dst || !_mesa_is_bufferobj(dst)) {
+   if (!_mesa_is_bufferobj(dst)) {
       _mesa_error(ctx, GL_INVALID_ENUM,
                   "glCopyBuffserSubData(writeTarget = 0x%x)", writeTarget);
       return;
@@ -1421,7 +1421,7 @@ _mesa_MapBufferRange(GLenum target, GLintptr offset, GLsizeiptr length,
    }
 
    bufObj = get_buffer(ctx, target);
-   if (!bufObj || !_mesa_is_bufferobj(bufObj)) {
+   if (!_mesa_is_bufferobj(bufObj)) {
       _mesa_error(ctx, GL_INVALID_ENUM,
                   "glMapBufferRange(target = 0x%x)", target);
       return NULL;
diff --git a/src/mesa/main/bufferobj.h b/src/mesa/main/bufferobj.h
index b4e70f2..c0d5a64 100644
--- a/src/mesa/main/bufferobj.h
+++ b/src/mesa/main/bufferobj.h
@@ -53,7 +53,7 @@ _mesa_bufferobj_mapped(const struct gl_buffer_object *obj)
 static inline GLboolean
 _mesa_is_bufferobj(const struct gl_buffer_object *obj)
 {
-   return obj->Name != 0;
+   return obj != NULL && obj->Name != 0;
 }
 
 
diff --git a/src/mesa/state_tracker/st_draw.c b/src/mesa/state_tracker/st_draw.c
index 05a71d3..fd1c8ee 100644
--- a/src/mesa/state_tracker/st_draw.c
+++ b/src/mesa/state_tracker/st_draw.c
@@ -325,7 +325,7 @@ is_interleaved_arrays(const struct st_vertex_program *vp,
          if (abs(array->Ptr - firstPtr) > firstStride)
             return GL_FALSE; /* arrays start too far apart */
 
-         if ((!bufObj || !_mesa_is_bufferobj(bufObj)) != userSpaceBuffer)
+         if ((!_mesa_is_bufferobj(bufObj)) != userSpaceBuffer)
             return GL_FALSE; /* mix of VBO and user-space arrays */
       }
    }
@@ -390,7 +390,7 @@ setup_interleaved_attribs(struct gl_context *ctx,
    }
 
    /* are the arrays in user space? */
-   usingVBO = bufobj && _mesa_is_bufferobj(bufobj);
+   usingVBO = _mesa_is_bufferobj(bufobj);
 
    for (attr = 0; attr < vpv->num_inputs; attr++) {
       const GLuint mesaAttr = vp->index_to_input[attr];
@@ -497,7 +497,7 @@ setup_non_interleaved_attribs(struct gl_context *ctx,
 
       assert(element_size == array->Size * _mesa_sizeof_type(array->Type));
 
-      if (bufobj && _mesa_is_bufferobj(bufobj)) {
+      if (_mesa_is_bufferobj(bufobj)) {
          /* Attribute data is in a VBO.
           * Recall that for VBOs, the gl_client_array->Ptr field is
           * really an offset from the start of the VBO, not a pointer.
@@ -599,7 +599,7 @@ setup_index_buffer(struct gl_context *ctx,
       }
 
       /* get/create the index buffer object */
-      if (bufobj && _mesa_is_bufferobj(bufobj)) {
+      if (_mesa_is_bufferobj(bufobj)) {
          /* elements/indexes are in a real VBO */
          struct st_buffer_object *stobj = st_buffer_object(bufobj);
          pipe_resource_reference(&ibuffer->buffer, stobj->buffer);
@@ -775,7 +775,7 @@ handle_fallback_primitive_restart(struct pipe_context *pipe,
    info.primitive_restart = FALSE;
    info.instance_count = 1;
 
-   if (ib->obj && _mesa_is_bufferobj(ib->obj)) {
+   if (_mesa_is_bufferobj(ib->obj)) {
       ptr = pipe_buffer_map_range(pipe, ibuffer->buffer,
                                   start * ibuffer->index_size, /* start */
                                   count * ibuffer->index_size, /* length */